Antenna



FIG. 1 is a front perspective view of an antenna showing my new design;

FIG. 2 is a top plan view of the antenna of FIG. 1;

FIG. 3 is a front elevation view of the antenna of FIG. 1;

FIG. 4 is a rear elevation view of the antenna of FIG. 1;

FIG. 5 is a bottom plan view of the antenna of FIG. 1;

FIG. 6 is a left-side elevation view of the antenna of FIG. 1; and,

FIG. 7 is a right-side elevation view of the antenna of FIG. 1.

I claim the ornamental design for an antenna, as shown.